The rules of origin seek to reflect commercial and production practices. It is obvious that a product can only be purchased or produced by one country, but it can also be a product manufactured with the contribution of several countries. Therefore, the criteria for determining the origin of goods – the most important element in all the rules of origin – are taken into account in these two situations. The WTO manages the original agreement. It holds commissions for the rules of origin. Although the WTO`s work in the WTO concerns non-preferential rules of origin, the current LDC Rules of Origin initiative is an important work that the WTO is pursuing. It requires members who undertake, in accordance with ministerial declarations, to submit notifications regarding their rules of origin in preferential treatment of LDCs. The WTO website on non-preferential rules of origin provides an archive of documents on members` non-preferential rules of origin.  It also provides a database of preferential rules of origin declared under the LDC initiative.  Validity period: a provision setting the duration of a certificate of origin or declaration of origin (see proof of origin) applies from the date of its issuance. (i) Minimum percentage of value added for finished products (construction or direct verification): Manufacturing or processing operations in the country of origin must reach a certain level, i.e.
the percentage of value they add to finished products corresponds to or exceeds a certain threshold for the latter to obtain its origin. This test requires consideration between the value of the content created at the regional or local level and the value of the final product. As a result, the rigour of the rules of origin would increase with the threshold of regional or national content. For example, a rule that imposes 40% regional value content will be stricter than a rule that requires 35%. While awaiting the completion of the work program for the harmonization of The Part IV rules of origin, members ensure that, at the request of an exporter, importer or person with a justified cause, assessments of the origin they would make to a case are issued as soon as possible and no later than 150 days (3) after requesting such an assessment. , provided all the necessary elements have been presented. Applications for assessment are accepted before the start of trade in the property concerned and may be accepted at a later date. These assessments remain valid for three years, provided that the facts and conditions, including the rules of origin, are comparable. If the parties concerned are informed in advance, these assessments are no longer valid when a decision contrary to the assessment is made as part of a review in accordance with point (j). These assessments are made available to the public, subject to the provisions of point (k); As criteria for determining the economic nationality of goods, the role of rules of origin is inherently based on the fact that a number of trade policy measures are applied on the basis of the origin of imports.